Abstract：When phosphorus, sulfur and carbon elements are analyzed by laser-induced breakdown spectroscopy (LIBS), the analysis wavelength is generally between 165 and 200nm, which is the vacuum ultraviolet spectrum area, and there are certain difficulties in quantitative analysis. According to the characteristics of iron ore samples and the characteristics of the analysis elements, phosphorus, sulfur and carbon in iron ore certified reference materials which were tablet pressed (pressure was 20t, constant pressure time was 10s) was quantitatively characterized by LIBS technology. The final selection of the sample chamber environment was evacuated and filled with argon (Ar), and the vacuum degree of the sample chamber was 50Pa. The ablation conditions for excitation were 20 pre-ablation and 30 ablation. The calibration curve of quantitative characterization of phosphorus, sulfur and carbon were drawn with the linear correlation coefficients of 0.998, 0.997, and 0.998 respectively. Thus, a quantitative characterization method for composition in iron ore was established based on LIBS technology. Phosphorus, sulfur and carbon in the iron ore certified reference material was analyzed quantitatively by the proposed characterization method. The analysis results of phosphorus, sulfur in the certified reference material of GSB03-2023-2006 were consistent with the certified values. The analysis results of phosphorus, sulfur and carbon in the certified reference material of GSB03-2855-2012 were consistent with the certified values. The results showed that LIBS could realize rapid quantitative characterization for phosphorus, sulfur and carbon in iron ore.
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